Scratched discs can be polished by a professional machine
I Had The Same Problem. i Tried The Toothpaste Trick. didn't Work. I Lost Hope Untill My Little Bro. Smeared Nuttella All Over It. I Screamed At Him! then After I Cleaned It Off I Inserted It Into My Ps3 And It Finally Came On I dont know how but it works
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you can't you will have to buy another one because ps3 discs are always getting scratched if it was a wii disc you could repair it but ps3 discs you can't and ps3 sucks the wii is awsome even the ps2 is better than the ps3
Look at the game disc and make sure it is not scratched or dirty.
Bring it to your local game store and ask if they fix scratched disks.
tooth paste? are you kidding? you cant fix a game with tooth paste
get a soft cloth some CD cleaner and a CD rotater the clean it